Acme Powerwash came out and cleaned all the concrete at my house this week. It was awesome to stand there and watch them remove a decade's worth of gunk and filth. The water pouring down my driveway was literally black from all the crud they cleaned out of the garage. My wife's car had leaked oil all over the driveway and garage due to a loose oil filter from an unnamed quick lube establishment. I had tried to scrub it off with some stuff from Costco, but I barely made a dent in it. Their big pressure washing machines made short work of it. My garage was like a sauna from all the steam! I had a ton of paint overspray, drips, and even footprints in my garage from where the previous homeowner had spilled paint and let his two year old walk through it. It's all gone, I don't have a speck of paint anywhere now. They also removed hard water stains from a flower pot on my front porch and grease stains from where my bbq sits on my patio. The only thing they didn't remove completely was a couple of rust spots on my driveway but they are definitely lighter than they were before. Overall I'm highly impressed, it was well worth the price. It probably hasn't been this clean since the day they poured the slab. I should have done it years ago, or at least made the previous homeowner do it before I bought the house!